CN1178368C - Motor - Google Patents
Motor Download PDFInfo
- Publication number
- CN1178368C CN1178368C CNB99105203XA CN99105203A CN1178368C CN 1178368 C CN1178368 C CN 1178368C CN B99105203X A CNB99105203X A CN B99105203XA CN 99105203 A CN99105203 A CN 99105203A CN 1178368 C CN1178368 C CN 1178368C
- Authority
- CN
- China
- Prior art keywords
- magnet
- stator
- magnetic pole
- coil
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000696 magnetic material Substances 0.000 claims description 14
- 230000004936 stimulating effect Effects 0.000 claims description 6
- 230000005415 magnetization Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 abstract 2
- 230000005284 excitation Effects 0.000 description 76
- 230000004907 flux Effects 0.000 description 20
- 230000014509 gene expression Effects 0.000 description 18
- 238000001746 injection moulding Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000000354 decomposition reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000007723 die pressing method Methods 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 241001212149 Cathetus Species 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/125—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets having an annular armature coil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/12—Transversal flux machines
Abstract
A motor provided with a rotor magnet circumferentially divided into n section which are alternately magnetized to different poles, a coil disposed axially of the rotor magnet, outer magnetic poles and inner magnetic poles excited by the coil being opposed to the outer peripheral surface and inner peripheral surface, respectively, of the rotor, and a holder for holding the rotor magnet at a position at which the centers of the poles of the magnet deviate from a line linking the centers of the outer magnetic poles and the center of rotation of the magnet together when the outer magnetic poles and the inner magnetic poles are not excited, whereby the motor is made into a one-phase motor to thereby stabilize the initial positioning of the rotor and also, the motor is made high in output and super-compact.
Description
The present invention relates to a kind of motor of microminiature structure.
So far, for the motor that forms with the miniature motor form, small cylinder shape stepping motor shown in Figure 24 in the drawings attached for example.
In Figure 24, this motor is provided with two stators 102 along the axial arrangement of motor, and stator 102 respectively has two stator yoke 106, is arranged as vertically opposition mutually.In each stator 102, stator coil 105 is wrapped on the bobbin 101 that is kept by two stator yoke 106 coaxially.Each bobbin 101 that is wound with stator coil 105 on it is clipped between two stator yoke 106 vertically, and fixing by these two stator yoke 106.Stator yoke 106,106 respectively is formed with stator tooth 106a and 106b, and they are alternately along the circumference of the inside diameter surface of bobbin 101.On the other hand, the stator yoke with stator tooth 106a and 106b is fixed on the shell 103 of each stator 102 106 and 106.Like this, constitute stator 102.
(one on the left side shown in Figure 24) fixes a flange 115 and a bearing 108 on one in two groups of shells 103, and (one on the right shown in Figure 24) fixes one to side bearing 108 on another shell 103.Rotor 109 is this spline structure, promptly rotor magnet 111 is fixed on the armature spindle 110.Between the inside diameter surface of the stator yoke 106 of the outer surface of rotor magnet 111 and stator 102, form the air gap.Armature spindle 110 is rotatably supported by two bearings 108 that are fixed on each shell 103.
Figure 26 is a plane graph in the accompanying drawing, the stepping motor of meter or other similar devices when illustrating by being used for of coil drive.In Figure 26, rotor that comprises permanent magnet of label 201 expressions, label 202 and 203 expression stators, and label 204 expression coils.
Yet in the small-sized stepping motor of prior art shown in Figure 24, shell 103, bobbin 101, stator coil 105 and stator yoke 106 are arranged in peritrochanteric coaxially, and bring the external dimensions of motor to become big inconvenience like this.And,, mainly pass through the end surfaces 106a of stator tooth 106a by the magnetic flux that electric excitation produced of stator coil 105 as shown in Figure 25 in the accompanying drawing
1End surfaces 106b with stator tooth 106b
1Therefore, do not act on effectively on the rotor magnet 111, and problem to be solved is arranged is that the output of motor does not uprise.And in motor shown in Figure 26, it is the little gap portion of the flux concentrating that electric excitation produced between rotor 201 and stator 202 of coil 204 that problem to be solved is arranged, and does not act on effectively on the magnet 201.
As U.S. Patent No. 5,831,356 is such, and the applicant who applies for substantially in the basis of Japan has proposed a kind of motor that solves such problem.
This motor that is proposed designs like this, so that rotor forms cylindrical shape, this rotor comprises one along the equidistant division of circumference, and alternately be magnetized into the permanent magnet of different poles, make first coil, the rotor and second coil are by specified order axial arranged along rotor, outer surface with rotor is relative with interior perimeter surface respectively with first internal magnetic pole by first outer magnetic pole of first coil stimulating, and the outer surface with rotor is relative with interior perimeter surface respectively with second internal magnetic pole by second outer magnetic pole of second coil stimulating, and one is stretched out from the cylindrical shape permanent magnet for the rotating shaft of armature spindle.
The output of the motor of structure is high like this, and can make its external dimensions little, but because the radial dimension of its internal magnetic pole is little, so the processing difficulties of its magnetic pole tooth, but also wish and can obtain pulsation-free stable output to the motor of size from path.
Therefore, the applicant that the basis of submitting in Japan is applied for has substantially proposed a kind of motor recently, wherein as U.S. Patent application No.08/994,994 is such, and the shape of internal magnetic pole is processed easily, and as U.S. Patent application No.09/022,474 is such, proposed a kind of rotor, wherein at a path output conveyer is installed on the rotating shaft of size easily, for example gear and belt, thus pulsation-free stable output obtained.
Recently, wish to obtain a kind of motor, it has high output, and can microminiature ground structure.
The present invention In view of the foregoing proposes, and an one purpose provides a kind of motor, and this motor output is high, and microminiature ground structure more.
Another object of the present invention is when motor is made single-phase motor, makes the positioning stablity of rotor.
According to the present invention, a kind of motor is provided, be provided with a rotatable rotor magnet, along circle alternate be magnetized into different poles, a cylindrical stator, relative with described rotor magnet, between them, leave the gap, and coil, be installed in the inside of described stator, it is characterized in that described coil is axial arranged along described rotor magnet, be subjected to the outer magnetic pole of described stator of described coil stimulating relative with the outer surface of described magnet, the internal magnetic pole of described stator is relative with the interior perimeter surface of described magnet, and the preparation holding device, so that described magnet remains on a position, depart from mutually with the straight line that the pivot of the center of described outer magnetic pole and described magnet is linked together at the center of the utmost point of described magnet under this position.
The present invention also provides a kind of motor, has a magnet, a cylindrical stator, and coil, axial arranged along described magnet to encourage described stator, the internal magnetic pole of wherein said stator is relative with the interior perimeter surface of described magnet, the outer magnetic pole of described stator is relative with the outer surface of described magnet, described outer magnetic pole has first relative with described internal magnetic pole and the second portion not relative with described internal magnetic pole, the wherein said magnet part relative with described second portion with described first be alternating magnetization along the circumferential direction, and phase place of phase deviation of the described magnet part relative with the described first part relative with described second portion with respect to described magnet is magnetized.
The present invention also provides a kind of motor, be provided with a rotatable rotor magnet, along circle alternate be magnetized into different poles, a cylindrical stator, relative with described rotor magnet, between them, leave the gap, and coil, be installed in the inside of described stator, it is characterized in that, a cylinder part that forms with soft magnetic material is fixed on the inner-diameter portion whose of described rotor magnet, make described coil axial arranged along described rotor magnet, be subjected to the outer magnetic pole of described stator of described coil stimulating relative, and the internal magnetic pole of described stator is relative with the interior perimeter surface of described cylinder part with the outer surface of described magnet.
Therefore, the diameter of motor of the present invention can be for being enough to make the magnetic pole size relative with the diameter of described rotor magnet of stator, and the length of motor can add the length of described coil for the length of described rotor magnet, like this, make the diameter and the length of rotor magnet and coil very little, thereby make motor make microminiature, and by described holding device is set, the stop position of rotor magnet is such position when making described coil not be subjected to electric excitation, depart from mutually with the straight line that the pivot of the center of described outer magnetic pole and described rotor magnet is linked together at the center of each utmost point of the magnetized spot of described rotor magnet under this position, and under this position, make coil be subjected to electric excitation, thereby necessarily mean direction of rotation by being excited outer magnetic pole the power on the magnetized spot of rotor magnet of acting on, become thus and might start rotor magnet smoothly to rotor magnet.
Therefore, can make the diameter of rotor magnet and coil and length very little according to the present invention, thereby make motor make microminiature, and described cylinder part can prevent that the magnetic flux of described rotor magnet from draining to the inner-diameter portion whose of described cylinder part and the internal magnetic pole of described stator, thereby the stop position of rotor magnet is such position when making described coil not be subjected to electric excitation, depart from mutually with the straight line that the pivot of the center of described outer magnetic pole and described rotor magnet is linked together at the center of each utmost point of the magnetized spot of described rotor magnet under this position, and under this position, make coil be subjected to electric excitation, thereby make and be excited outer magnetic pole the power on the magnetized spot of rotor magnet of acting on and point to the direction of rotation of rotor magnet, can start rotor magnet smoothly thus.
Other purposes of the present invention will become apparent from following narration to specific embodiments more of the present invention.
Fig. 1 is the decomposition diagram according to the motor of embodiments of the invention 1.
Fig. 2 is the sectional drawing of motor shown in Figure 1 at its assembly process.
Fig. 3 represents the rotor and the relation of the position between the stator of motor shown in Figure 2, and the state of expression rotor when coil is not subjected to electric excitation.
Fig. 4 is illustrated under Fig. 3 state the state of rotor when coil is subjected to electric excitation.
Fig. 5 is illustrated under Fig. 4 state the state of rotor when the electric excitation that makes coil cuts off.
Fig. 6 is illustrated under Fig. 5 state the state of rotor when the electric excitation that makes coil is reverse.
Fig. 7 is the decomposition diagram according to the motor of embodiments of the invention 2.
Fig. 8 is the sectional drawing of motor shown in Figure 7 at its assembly process.
Fig. 9 represents the rotor and the relation of the position between the stator of motor shown in Figure 8, and the state of expression rotor when coil is not subjected to electric excitation.
Figure 10 is illustrated under Fig. 9 state the state of rotor when coil is subjected to electric excitation.
Figure 11 is illustrated under Figure 10 state the state of rotor when the electric excitation that makes coil cuts off.
Figure 12 is illustrated under Figure 11 state the state of rotor when the electric excitation that makes coil is reverse.
Figure 13 is the decomposition diagram according to the motor of embodiments of the invention 3.
Figure 14 is the sectional drawing of motor shown in Figure 13 at its assembly process.
Figure 15 is the sectional drawing of state of the magnetic flux of expression magnet shown in Figure 14.
Figure 16 represents the rotor and the relation of the position between the stator of motor shown in Figure 14, and the state of expression rotor when coil is not subjected to electric excitation.
Figure 17 is illustrated under Figure 16 state the intermediateness of rotor when coil is subjected to electric excitation.
Figure 18 is illustrated under Figure 16 state the end-state of rotor when coil is subjected to electric excitation.
Figure 19 is illustrated under Figure 18 state first intermediateness of rotor when the electric excitation that makes coil is reverse.
Figure 20 is illustrated under Figure 18 state second intermediateness of rotor when the electric excitation that makes coil is reverse.
Figure 21 is illustrated under Figure 18 state the end-state of rotor when the electric excitation that makes coil is reverse.
Figure 22 represents it is not adopted the rotor and the relation of the position between the stator of the motor of measure of the present invention, and first stable state of expression rotor when coil is not subjected to electric excitation.
Figure 23 is illustrated in Figure 22 second stable state of rotor when coil is not subjected to electric excitation down.
Figure 24 is the sectional drawing according to the stepping motor of prior art.
Figure 25 is the explanation according to the magnetic flux of the stepping motor of prior art shown in Figure 24.
Figure 26 is the plane graph according to the single-phase motor of prior art.
Hereinafter will narrate some embodiments of the present invention with reference to the accompanying drawings.
Before narration embodiments of the invention 1, at first will be with reference to figure 1 and Fig. 2, narration is according to the basic structure of stepping motor of the present invention.Fig. 1 is the decomposition diagram of this stepping motor, and Fig. 2 is the sectional drawing of motor shown in Figure 1 at its assembly process.
In Fig. 1 and Fig. 2, be provided with a rotatable rotor magnet 1 according to motor of the present invention, along alternately being magnetized into different poles on every side, a cylindrical stator 18, relative with rotor magnet 1, between them, leave the gap, and coil 2, be installed in the inside of stator 18, coil 2 is axial arranged along rotor magnet 1, outer magnetic pole 18a by the stator 18 of coil 2 excitation is relative with the outer surface of magnet 1 with 18b, the internal magnetic pole 18c of stator 18 is relative with the interior perimeter surface of magnet 1 with 18d, and the preparation holding device so that magnet remains on a position, departs from the straight line that the pivot of the center of outer magnetic pole and magnet is linked together mutually at the center of the utmost point of this position lower magnet.In narration subsequently, will by motor situation narration the present invention of stepping motor.
In Fig. 1 and Fig. 2, the magnet (rotor magnet) 1 that constitutes rotor makes its outer surface be divided into a plurality of parts (being four parts in the present embodiment) along circumference, and alternately is magnetized into the S and the N utmost point.In magnetized spot 1a, 1b, 1c and 1d, magnetized spot 1a and 1c are magnetized into the S utmost point, and magnetized spot 1b and 1d are magnetized into the N utmost point.In Fig. 3, the central representation of the utmost point of magnetized spot 1a, 1b, 1c and 1d is K
1, K
2, K
3And K
4And the plasticity magnetic material that magnet 1 usefulness injection molding forms is made.By magnet 1 is made by plasticity magnetic material like this, then can make its cylindrical shape thickness radially very little for rotor magnet.
The core of rotor magnet 1 is formed with an axially extending bore, and forms an assembled portion 1e at the axial mid portion of this through hole, makes its internal diameter very little.For the output shaft 7 of armature spindle forces the assembled portion 1e that is pressed into rotor magnet 1, and be fixed on the magnet 1.Magnet 1 comprises a kind of by the molded plastic magnet of injection molding, therefore, even application examples as armature spindle 7 being forced be pressed into the assemble method of assembled portion, can not make its destroy yet.And, even magnet 1 is complicated shape, partly have the assembled portion 1e of little internal diameter in the axial centre of its through hole, also can easily make it.And, be pressed into so that output shaft 7 and magnet 1 fit together and fixed by forcing, therefore, assembling becomes easily, and becomes and might make motor cheaply.Rotor (Magnmet rotor) 1 is made of output shaft 7 and magnet 1.
For the material of magnet 1, use a kind of plastic magnet that certain mixture is carried out injection molding formation, this mixture for example is the mixture of Nd-Fe-B rare-earth magnetic and thermoplastic resin binding material such as polyamide.Like this, the bending strength of mold pressing magnet is about 500kgf/cm
2, and for example when during as binding material, obtaining 800kgf/cm with polyamide
2Or bigger bending strength, therefore, can provide such with the irrealizable thin cylinder shape of die pressing.As hereinafter narrating, make magnet make the performance that thin-walled shape has been improved motor.And, by using above-mentioned plastic magnet, the shape of select magnet freely, and can obtain to use die pressing, just fixed rotor axle 7 with become global shape the effect that can not provide, and can obtain enough armature spindle constant intensities.And magnet strength is good, therefore, promptly uses and forces the method that is pressed into armature spindle 7, also will can not damage (destruction) armature spindle 7.
Simultaneously, the standing part of Unitarily molded armature spindle 7, thereby improve magnet segment and armature spindle coaxial precision partly, and become and to reduce vibration, but also become the clearance distance that might reduce between magnet 1 and the stationary part, although the magnetic characteristic of mold pressing magnet is 8MGOe or bigger, and the magnetic characteristic of injection molding magnet is about 5 to 7MGOe, still can obtain enough motor output torques.And injection molding magnet is formed with thin resinous coat on its surface, therefore, compares with mold pressing magnet, and making gets rusty is greatly reduced, and can save the antirust process that for example adds coating.And, do not have adhering to of magnetic, magnetic be a problem attached to compression in the magnet, therefore and not incident superficial expansion during antirust coat, can improve quality.
In Fig. 1 and Fig. 2, coaxial and axial arranged along magnet 1 of solenoid coil 2 and magnet 1.The external diameter of coil 2 equals the external diameter of magnet 1 substantially.Stator 18 usefulness soft magnetic materials form, and comprise a urceolus part and an inner cylindrical portion.Coil 2 is installed between the urceolus part and inner cylindrical portion of stator 18.By this coil 2 of electric excitation, stator 18 is excited.The fore-end of the urceolus part of stator 18 forms outer magnetic pole 18a and 18b, and the fore-end of the inner cylindrical portion of stator 18 forms internal magnetic pole 18c and 18d.Internal magnetic pole 18c and internal magnetic pole 18d be with the skew of 360/0.5n degree, promptly in the present embodiment when number of magnetic poles is 4 the skews with 180 degree form so that their homophases mutually.Outer magnetic pole 18a arranges with the relation relative with internal magnetic pole 18c, and outer magnetic pole 18b arranges with the relation relative with internal magnetic pole 18d.
The outer magnetic pole 18a of stator 18 and 18b form by otch with along the tooth with the extension of axle parallel direction.Use this structure, become and to form magnetic pole, make the diameter minimum of motor simultaneously.Just, if form outer magnetic pole by radially inhomogeneous extension, then the diameter of motor will be correspondingly bigger, but in the present embodiment, outer magnetic pole forms by otch with along the tooth with the extension of axle parallel direction, therefore, can make the diameter minimum of motor.
Outer magnetic pole 18a, the 18b of stator 18 and internal magnetic pole 18c, 18d are provided with the relation relative with interior perimeter surface with the outer surface of an end of rotor magnet 1, so that an end of rotor magnet 1 is clipped between them.And an end parts 7b of output shaft 7 rotatably is assemblied among the hole 18e of stator 18.Therefore, the magnetic flux that is produced by coil 2 passes and is the magnet 1 of rotor between outer magnetic pole 18a, 18b and internal magnetic pole 18c, the 18d, therefore, acts on effectively on the magnet into rotor, and has improved the output of motor.And as mentioned before, the plasticity magnetic material that magnet 1 all injection moldings form forms, and its thickness radially is very little relatively thereby can make drum.Therefore, can make outer magnetic pole 18A, the 18b of stator 18 and the distance between internal magnetic pole 18c, the 18d very little, and can make the magnetic resistance of coil 2 and the formed magnetic circuit of first stator little.Thus, can produce a large amount of magnetic fluxs, therefore, can realize increasing motor output and reduce motor power (output) consumption, and reduce coil with little electric current.
The cover of the pipe that one of label 20 expression forms with non-magnetic material, and make the outer radius portion (forming the part of outer magnetic pole 18a and 18b it on) of stator 18 assemble and adhere to or be fixed on this on the contrary and cover on 20 the inner-diameter portion whose 20a.The assembled portion 7a of output shaft 7 rotatably is assemblied among the pilot hole 20b of cover 20, and an end parts 7b of output shaft 7 rotatably is assemblied among the pilot hole 18e of stator 18.
Fig. 3 to Fig. 6 is graphic extension, uses the operation of sectional drawing sequence list diagrammatic sketch 2 motor of being got along Fig. 2 cathetus 3-3.In Fig. 3 to Fig. 6, Q
1The center of the outer magnetic pole 18a of expression stator 18, Q
2The center of the outer magnetic pole 18b of expression stator 18, and Q
3The pivot of expression rotor magnet 1.The location stator that label 21 and 22 expressions form with soft magnetic material.The inner-diameter portion whose 20a that these location stators 21 and 22 are fixed on cover 20 goes up (Fig. 2).
By location stator 21 and 22 is set, the stop position of magnet is not arranged on position shown in Figure 3 when coil 2 is not subjected to electric excitation.Just, magnet 1 is set, so that under a certain position, stop (position shown in Figure 3), the center K of the utmost point of the magnetized spot of magnet 1 wherein
1, K
2, K
3And K
4Depart from mutually with the straight line L1 that the pivot of the center of the outer magnetic pole 18a of stator 18 and 18b and magnet 1 is linked together.With regard to K
2, magnet stops a position of departing from the θ angle.As mentioned before, when coil 2 is subjected to electric excitation under this position, location stator 21 and 22 is not excited, but outer magnetic pole 18a, 18b and internal magnetic pole 18c, 18d are excited, and is excited the power that outer magnetic pole 18a, 18b act on the magnetized spot of magnet 1 and must points to along the direction of rotation of magnet 1.Therefore, magnet (rotor magnet) 1 is started smoothly.
Do not locate at motor under the situation of stator 21 and 22, the magnet 1 stable position that stops not is the position shown in Figure 22 or 23 when coil 2 is not subjected to electric excitation.Figure 22 and Figure 23 are typical section figure, expression magnet 1 stable these two positions that stop.Under Figure 22 position, the center K of the utmost point of the magnetized spot of magnet 1
1, K
2, K
3And K
4Be in center Q outer magnetic pole
1And Q
2Pivot Q with magnet 1
3On the straight line that links together, therefore, even coil 2 is subjected to electric excitation, electromagnetic force is also not according to the directive effect of rotary magnet 1.
Under the position of Figure 23, by electric excitation coil 2, might play moving magnet 1, if but do not change electric excitation with certain timing, then magnet 1 just can not rotate under its stable state.Just, under Figure 23 state, for example when making outer magnetic pole 18a and 18b be excited into the N utmost point, even magnet 1 stop at Figure 22 same position after, make the electric excitation of coil 2 become relative direction, and make outer magnetic pole 18a and 18b be excited into the S utmost point, electromagnetic force is also as described in together with Figure 22, not according to the directive effect of rotary magnet 1. Location stator 21 and 22 is cooperated with rotor magnet 1, to constitute the holding device of holding magnet 1.Therefore and location stator 21 and 22 is arranged between the outer magnetic pole 18a and 18b of stator 18, can construct them and does not make the size of motor bigger.
Referring now to Fig. 3 to Fig. 6, narration is according to the operation of the stepping motor of the embodiment 1 of the invention described above.Under Fig. 3 state, when coil 2 is subjected to electric excitation, make outer magnetic pole 18a, the 18b of stator 18 be excited into the N utmost point thus, and when making internal magnetic pole 18c, the 18d of stator 18 be excited into the S utmost point, as magnet 1 rotation counterclockwise as shown in Figure 3 of rotor, and present state shown in Figure 4.Because location stator 21 and 22 is subjected to coil 2 excitations hardly, so the position of magnet 1 is determined by the magnetized spot of magnet 1 and outer magnetic pole 18a, the 18b of stator 18 and the energized condition of the suffered coil 2 of internal magnetic pole 18c, 18d substantially, and magnet is rendered as state shown in Figure 4.Under this state, when making the coil electricity go to swash, cause magnetic force institute stable status (position of Fig. 5) by magnet 1.
Secondly, reverse when the electric excitation that makes coil 2, make the outer magnetic pole 18a of stator 18 and 18b be excited into the S utmost point thus, and when making the internal magnetic pole 18c of stator 18 and 18d be excited into the N utmost point, magnet 1 as rotor is further rotated in the counterclockwise direction, and presents state shown in Figure 6., sequentially change the direction of the electric excitation of coil 2, thereby make magnet 1 as rotor rotate to the phase place consistent location with electric excitation thereafter.Just, make the motor rotation.Under the state of motor rotation, when the electric excitation that makes coil 2 cut off, motor stopped at Fig. 3 position, and the magnetic force by rotor magnet 1 under this position makes it stable.
According to the foregoing description 1, the diameter of motor can be for being enough to make the magnetic pole size relative with the outer surface of magnet 1 of stator 18, and the length of motor can add the length of coil 2 for the length of magnet 1.Like this, the size of motor determined by the diameter and the length of magnet 1 and coil 2, and very little by diameter and the length that makes magnet 1 and coil 2, can make motor make microminiature.Just, the diameter of motor is determined by outer magnetic pole 18a and the 18b relative with the outer surface of rotor magnet 1 substantially, and the axial length of motor is by axially arrange the coil 2 of (layout) and rotor magnet 1 to determine that electronic function is made very compact along it.
And the magnetic flux that is produced by coil 2 passes the magnet between outer magnetic pole and the internal magnetic pole, therefore effect effectively.In addition, preparation is by rotor magnet 1 and location stator 21 and 22 holding devices that constituted relative with the outer surface of magnet 1, therefore, during coil 2 non-excitations, can make magnet 1 remain on a position, the center of the utmost point of this position lower magnet 1 with the pivot Q of the center of outer magnetic pole and magnet
3The straight line that links together departs from mutually.Therefore, when the motor stopping period carries out electric excitation to coil 2 at first, do not point to the pivot of magnet 1, so become the level and smooth and stable start that might realize motor by the power of flux interaction on magnet 1 that coil 2 produces.
And, can use very small amount of parts, for example rotor magnet 1, coil 2, stator 18 and output shaft 7 are constructed motor, therefore, can the minimizing expense.And, make rotor magnet 1 form empty cylindrical shape, and outer magnetic pole 18a, 18b are relative with interior perimeter surface with the outer surface that this forms empty columnar rotor magnet 1 respectively with internal magnetic pole 18c, 18d, thereby obtain effectively output as electronic function.By being pressed into output shaft (armature spindle) 7 is fixed on the assembled portion 1e as the centre bore of the magnet 1 of rotor.Because rotor magnet 1 comprises a kind of plastic magnet that forms with injection molding, thus even by being pressed into assembling, rotor magnet 1 is destroyed, and even can easily make complicated shape, wherein partly be provided with the assembled portion 1e of little internal diameter in axial centre.And, assemble and fixedly output shaft 7 and magnet 1 by being pressed into, therefore, assembling easily, and the inexpensive possibility that creates.
To narrate this fact now, the stepping motor of promptly above embodiment 1 described structure is the best structure that is suitable for making flea-size motor.Just, the fact comprises, in the basic structure of stepping motor, at first make magnet 1 make the sky cylindrical shape, next makes the outer surface of rotor magnet 1 be divided into a plurality of parts along circumference, and alternately be magnetized into different poles, the 3rd, make coil 2 axial arranged along rotor magnet 1, the 4th, the outer surface with rotor magnet 1 is relative with interior perimeter surface respectively with internal magnetic pole by the outer magnetic pole of the stator 18 of coil 2 excitation, and the 5th, outer magnetic pole 18a and 18b are formed by otch with along the tooth with the extension of axle parallel direction, and the 6th, prepare holding device, with when coil 2 is not subjected to electric excitation, make rotor magnet 1 remain on a position, the center of the utmost point of this position lower rotor part magnet 1 with outer magnetic pole 18a, the pivot Q of the center of 18b and magnet 1
3The straight line that links together departs from mutually.
The diameter of this stepping motor (motor) can be for being enough to make the magnetic pole size relative with the diameter of rotor magnet 1 of stator 18, and the length of this stepping motor can add the length of coil 2 for the length of magnet 1.Like this, the size of this stepping motor determined by the diameter and the length of rotor magnet 1 and coil 2, and if make the diameter and the length of rotor magnet 1 and coil 2 very little, then can make stepping motor make microminiature.
At this moment, if make the diameter and the length of rotor magnet 1 and coil 2 very little, the precision that is difficult to keep stepping motor with becoming, but in the above-described embodiments, solve the precision problem of stepping motor with a kind of simple structure, wherein make rotor magnet 1 form empty cylindrical shape, and make the outer magnetic pole of stator 18 relative with the outer surface that forms empty columnar rotor magnet 1 respectively with interior perimeter surface with internal magnetic pole.In this case, if not only make the outer surface of rotor magnet 1, and the interior perimeter surface that makes rotor magnet 1 is divided into a plurality of parts and magnetized along circumference, then can further improve the output of motor.And, prepare holding device, so that rotor magnet 1 remains on deviation position, therefore, when coil 2 (initial electric excitation) when the motor stopping period is subjected to electric excitation, do not point to the pivot of magnet 1 by the power of flux interaction on magnet 1 of coil 2 excitation, therefore, can realize the level and smooth and stable start of motor.
And as mentioned before, the plasticity magnetic material that rotor magnet 1 usefulness injection molding forms forms, thereby can make it very little with respect to cylindrical shape thickness radially.Therefore, can make outer magnetic pole 18a, the 18b of stator 18 and the distance between internal magnetic pole 18c, the 18d very little, and can make the magnetic resistance of coil 2 and stator 18 formed magnetic circuits little.Thus, can produce a large amount of magnetic fluxs, and become and to realize increasing motor output and reduce motor power (output) consumption, and reduce coil with little electric current.
Referring now to Fig. 7 to Figure 12, narration embodiments of the invention 2, embodiment 2 specifies with same label with embodiment 1 identical part, and needn't specifically narrate.
Fig. 7 is the decomposition diagram according to the motor of embodiments of the invention 2, Fig. 8 is the sectional drawing of motor shown in Figure 7 at its assembly process, and Fig. 9 to Figure 12 is graphic extension, uses the operation of the motor of the sectional drawing sequence list diagrammatic sketch 7 got along Fig. 8 straight line 9-9 and Fig. 8.Present embodiment 2 represents that also motor is the situation of stepping motor.In present embodiment 2, holding device is that outer magnetic pole 18a and the 18b by further extension stator 18 constitutes.Outer magnetic pole 18a comprises the part 18a relative with 18d with internal magnetic pole 18c with 18b
1And 18b
1, and elongated portion 18a
2And 18b
2These elongated portions 18a
2And 18b
2Not relative with internal magnetic pole 18c and 18d, therefore, with opposition part 18a
1And 18b
1Relatively, even coil 2 is subjected to electric excitation, they also are magnetized hardly, and therefore do not produce actuating force.
As shown in Figure 7, with the part 18a of outer magnetic pole 18a and 18b
1And 18b
1Relative part E and with elongated portion 18a
2And 18b
2Between the relative part D, make rotor magnet 1 magnetization phase difference.Thus, as shown in Figure 9, when coil 2 was not subjected to electric excitation, the part E of magnet 1 remained on a position, with the magnetized spot 18a of 2 magnetized outer magnetic pole 18a of coil and 18b
1And 18b
1The center and the pivot Q of magnet 1
3The straight line that links together departs from mutually.On the other hand, elongated portion 18a
2And 18b
2Not relative with internal magnetic pole 18c and 18d, therefore with magnetized spot 18a
1And 18b
1Relatively, even coil 2 is subjected to electric excitation, they also are magnetized hardly, and do not produce actuating force.Therefore, by to coil 2 electric excitations and the magnetic flux that is produced by coil 2 passes magnetized spot 18a substantially
1, 18b
1With internal magnetic pole 18c, 18d, and therefore, the power on the rotor magnet 1 of acting on is not pointed to the pivot of rotor magnet.Therefore, can make the stable and starting smoothly of motor.
With magnetized spot 18a
1And 18b
1Relatively, even coil 2 is subjected to electric excitation, elongated portion 18a
2And 18b
2Also be magnetized hardly, and influence the actuating force that electric excitation produced of coil 2 hardly.Therefore, electronic function obtains enough and stable output.In present embodiment 2, by magnet 1 and the elongated portion 18a relative with the outer surface of magnet 1
2And 18b
2Constitute holding device so that magnet 1 remains on a position, the center of the utmost point of this position lower magnet 1 with the pivot Q of the center of outer magnetic pole 18a and 18b and magnet 1
3The straight line that links together departs from mutually.These elongated portions are corresponding to above-mentioned location stator 21 and 22, and formation and outer magnetic pole 18a and the integrally formed location of 18b stator.
Referring now to Fig. 9 to Figure 12, narration is according to the operation of the motor (stepping motor) of present embodiment 2.Under Fig. 9 state, when making coil 2 be subjected to electric excitation, make the outer magnetic pole 18a of stator 18 and 18b be excited into the N utmost point thus, and when making the internal magnetic pole 18c of stator 18 and 18d be excited into the N utmost point, as the just rotation in the counterclockwise direction as shown in Figure 9 of magnet 1 of rotor, and present state shown in Figure 10.Elongated portion 18a corresponding to above-mentioned location stator 21 and 22
2And 18b
2Be subjected to coil 2 excitation hardly, therefore, the position of magnet 1 is determined by the magnetized spot of magnet 1 and outer magnetic pole 18a, the 18b of stator 18 and the energized condition of the suffered coil 2 of internal magnetic pole 18c, 18d substantially, and magnet presents state shown in Figure 10.Under this state, when the electric excitation that makes coil 2 cuts off, cause the state of Figure 11, it is the magnetic force institute stable status by magnet 1.
Secondly, when make coil 2 electric excitation reverse, thereby make the outer magnetic pole 18a of stator 18 and 18b be excited into the S utmost point, and when making the internal magnetic pole 18c of stator 18 and 18d be excited into the N utmost point, then the magnet 1 as rotor is further rotated in the counterclockwise direction, and presents state shown in Figure 12.Thereafter, the direction of the electric excitation by sequentially changing coil 2 makes to rotate to a phase place consistent location with electric excitation for the magnet 1 of rotor.Just, make the motor rotation.Under the state of motor rotation, when the electric excitation that makes coil 2 cut off, motor stopped at the position of Fig. 9, and it is the magnetic force institute stable status by rotor magnet 1.
The embodiment 2 of Fig. 7 to Figure 12 embodiment 1 with Fig. 1 to Fig. 6 on above-mentioned main points is different.Therefore, according to the embodiment 2 of Fig. 7 to Figure 12, embodiment 1 similar effects of acquisition and Fig. 1 to Fig. 6 in addition, can obtain following effect.According to the embodiment 2 of Fig. 7 to Figure 12, holding device by with the integrally formed elongated portion 18a of the outer magnetic pole of stator 18
2And 18b
2And magnet 1 forms, and therefore, part count diminishes, and assembling becomes easily, and can also reduce expense.And as above-mentioned embodiment 1, the diameter of this stepping motor can be for being enough to make the magnetic pole size relative with the outer surface of magnet 1 of stator 18, and the length of motor can add the length of coil 2 for the length of magnet 1.Like this, the size of this motor determined by the diameter and the length of magnet 1 and coil 2, and very little by diameter and the length that makes magnet 1 and coil 2, can make motor make microminiature.
At this moment, if make the diameter and the length of magnet 1 and coil 2 very little, then become and be difficult to keep the precision of stepping motor, but can solve the precision problem of stepping motor with a kind of simple structure, wherein make magnet 1 form empty cylindrical shape, and make outer magnetic pole 18a, the 18b of stator 18 relative with the outer surface that forms empty columnar rotor magnet 1 respectively with interior perimeter surface with internal magnetic pole 18c, 18d.In this case, if not only make the outer surface of magnet 1, and the interior perimeter surface that makes magnet is divided into a plurality of parts and magnetized along circumference, then can further improve the output of motor.
Referring now to Figure 13 to Figure 21, narration embodiments of the invention 3, those are specified with same label with embodiment 1 identical part, and needn't specifically narrate.
Figure 13 is the decomposition diagram according to the motor of embodiments of the invention 3, and Figure 14 is the sectional drawing of motor shown in Figure 13 at its assembly process.In Figure 13 and Figure 14, the cylinder part 11 that forms with soft magnetic material is fixed on the interior perimeter surface of rotor magnet 1, make coil 2 axial arranged along rotor magnet 1, outer magnetic pole 18a by the stator 18 of coil 2 excitation is relative with the outer surface of magnet 1 with 18b, and makes the internal magnetic pole 18c of stator 18 relative with the interior perimeter surface of cylinder part 11 with 18d.Cylinder part 11 is used soft magnetic material, and for example electromagnetism soft iron or pure iron form.Therefore, the magnetic flux that magnet 1 never takes place drains in the inner-diameter portion whose of cylinder part 11 and goes.Figure 15 has represented to fix on it state of magnetic flux of the magnet 1 of cylinder part 11.
The operation of the motor of the sectional drawing sequence list diagrammatic sketch of being got along Figure 14 straight line 4-4 13 to Figure 15 is used in Figure 16 to Figure 21 graphic extension.In Figure 16 to Figure 21, Q
1The center of the outer magnetic pole 18a of expression stator 18, Q
2The center of the outer magnetic pole 18b of expression stator 18, and Q
3The pivot of expression rotor magnet 1.In Figure 13 to Figure 21, the cylinder part 11 that forms with soft magnetic material is fixed on the inner-diameter portion whose of rotor magnet 1, therefore, the magnetic flux that rotor magnet 1 never takes place drains to inner-diameter portion whose and the internal magnetic pole 18c and the 18d of cylinder part 11.Therefore, as shown in figure 16, during coil 2 non-excitations, the stop position of rotor magnet 1 is such position, under this position the center of each utmost point of magnetized spot with the center Q of the outer magnetic pole 18a of stator 18 and 18b
1And Q
2Pivot Q with magnet 1
3The straight line that links together departs from mutually.Under this position, when coil 2 is subjected to electric excitation, necessarily mean direction of rotation to magnet 1 by outer magnetic pole 18a and 18b the power on the magnetized spot of magnet 1 of acting on of being excited.Therefore, magnet (rotor magnet) 1 is started smoothly.
In the motor that is not provided with cylinder part 11, when coil 2 was not subjected to electric excitation, the magnet 1 stable position that stops was position shown in Figure 22 or position shown in Figure 23.Figure 22 and Figure 23 are the typical section figure of these two positions of expression.Therefore, if be not provided with cylinder part 11 with reference to figures 13 to 21 described stepping motors, then when coil 2 was not subjected to electric excitation, the magnet 1 stable position that stops was exactly Figure 22 or position shown in Figure 23.If magnet 1 stably stops as shown in figure 22, then the center of the magnetic pole of magnetized spot just is in the center Q outer magnetic pole
1Rotation Q with magnet 1
3On the straight line that links together, therefore, even coil 2 is subjected to electric excitation, electromagnetic force can be along the directive effect of rotary magnet 1 yet, therefore, and fail to start magnet.
Referring now to Figure 16 to Figure 21, narration is together with the operation of the described stepping motor according to embodiments of the invention 3 of Figure 13 to Figure 15.Under Figure 16 state, when coil 2 is subjected to electric excitation, thereby make the outer magnetic pole 18a of stator 18 and 18b be excited into the N utmost point, and when making the internal magnetic pole 18c of stator 18 and 18d be excited into the S utmost point, then the magnet 1 as rotor rotates 45 ° as shown in figure 16 in the counterclockwise direction, and present state shown in Figure 17, and because inertia is further rotated position shown in Figure 180.Under Figure 18 state, the center of the utmost point of magnetized spot is not on the straight line that the pivot of the center of outer magnetic pole and magnet 1 is linked together, therefore, change the electric excitation of coil 2 in the timing of Figure 18, thereby make the outer magnetic pole 18a of stator 18 and 18b be excited into the S utmost point, and make the internal magnetic pole 18c of stator 18 and 18d be excited into the N utmost point, rotor magnet 1 obtains rotary driving force and rotation thus.
Therefore, magnet 1 is through Figure 19 state, and further rotation in the counterclockwise direction, and moment by the stable state under the electric excitation state shown in Figure 20, and owing to inertia is further rotated, and rotate to position shown in Figure 21.Under Figure 21 state, the center of the utmost point of magnetized spot is not on the straight line that the pivot of the center of outer magnetic pole and magnet 1 is linked together, therefore, change the electric excitation of coil 2 in the timing of Figure 21, thereby make the outer magnetic pole 18a of stator 18 and 18b be excited into the N utmost point, and make the internal magnetic pole 18c of stator 18 and 18d be excited into the S utmost point, rotor magnet 1 obtains rotary driving force and rotation thus., repeat carry out together with Figure 16 to Figure 21 described electric excitation, make rotor magnet 1 rotation thus thereafter.Just, make the motor rotation.Under the state of motor rotation, when the electric excitation that makes coil 2 cuts off, cause the stable state of Figure 16 or Figure 19, to be motor come stable status by the magnetic force of rotor magnet 1 for this.As mentioned before, under this state, when coil 2 was subjected to electric excitation, therefore electromagnetic force, in the time will making its starting again, can play moving magnet smoothly along the directive effect of rotary magnet 1.
According to the foregoing description 3, the diameter of motor is determined by outer magnetic pole 18a and the 18b relative with the outer surface of rotor magnet 1 substantially, and the axial length of motor is by arrangement (layout) coil 2 and rotor magnet 1 are definite vertically, and it is very small-sized that motor is made.And the magnetic flux that is produced by coil 2 passes the magnet between outer magnetic pole and the internal magnetic pole, therefore effect effectively.In addition, cylinder part 11 prevents magnetic flux that the inner-diameter portion whose of rotor magnet 1 produces walk around internal magnetic pole 18c and 18d, and during the non-excitation of coil 2, it makes rotor magnet 1 remain on a position of departing from mutually with the straight line that the pivot of the center of outer magnetic pole and magnet is linked together, therefore, when the motor stopping period carries out electric excitation to coil 2 at first, do not point to the pivot of magnet by the power of flux interaction on magnet of coil 2 generations, therefore, become and to carry out smooth starting and stable rotation.
And, the very small amount of parts of electronic function, for example rotor magnet 1, coil 2, stator 18, output shaft 7 and cylinder part 11 constitute, and therefore, expense are reduced.And, make rotor magnet 1 form empty cylindrical shape, and make outer magnetic pole 18a, 18b relative with the outer surface that forms empty columnar rotor magnet 1 respectively, thereby obtain effectively output as electronic function with interior perimeter surface with internal magnetic pole 18c, 18d.By being pressed into output shaft (armature spindle 7) is fixed on the assembled portion 1e into the centre bore of the magnet 1 of rotor.Rotor magnet 1 comprises a kind of plastic magnet that forms with injection molding, and therefore, even by being pressed into assembling, rotor magnet 1 does not destroy yet, and even can easily make complicated shape, wherein partly be provided with the assembled portion 1e of little internal diameter in axial centre.And, assemble and fixedly output shaft 7 and magnet 1 by being pressed into, therefore, assembling and is easy to create possibility easily.
The stepping motor that at length narrate above embodiment 3 described structures now is the best structure that is suitable for making flea-size motor.Just, the fact comprises, advance in the basic structure of motor at this, at first make rotor magnet 1 make the sky cylindrical shape, next makes the outer surface of rotor magnet 1 be divided into a plurality of parts along circumference, and alternately be magnetized into different poles, the 3rd, make coil 2 axial arranged along rotor magnet 1, the 4th, the outer surface with rotor magnet 1 is relative with interior perimeter surface respectively with internal magnetic pole by the outer magnetic pole of the stator 18 of coil 2 excitations, the 5th, outer magnetic pole 18a and 18b are formed with the tooth that axle extends in parallel by otch and edge, and the 6th, the cylinder part 11 that forms with soft magnetic material is fixed on the inner-diameter portion whose of rotor magnet 1.
The diameter of this stepping motor (motor) can be for being enough to make the magnetic pole size relative with the diameter of rotor magnet 1 of stator 18, and the length of this stepping motor can add the length of coil 2 for the length of rotor magnet 1.Like this, the size of this stepping motor determined by the diameter and the length of rotor magnet 1 and coil 2, and if make the diameter and the length of rotor magnet 1 and coil 2 very little, then can make motor make microminiature.
At this moment, if make the diameter and the length of rotor magnet 1 and coil 2 very little, the precision that is difficult to keep stepping motor with becoming, but in the above-described embodiments, solve the precision problem of stepping motor with a kind of simple structure, wherein make rotor magnet form the sky cylindrical shape, and make the outer magnetic pole of stator 18 relative with the outer surface that forms empty columnar rotor magnet 1 respectively with interior perimeter surface with internal magnetic pole.In this case, if not only make the outer surface of magnet 1, and the interior perimeter surface that makes rotor magnet 1 is divided into a plurality of parts and magnetized along circumference, then can further improve the output of motor.
And cylinder part 11 can prevent that the magnetic flux of rotor magnet 1 from draining to inner-diameter portion whose and the internal magnetic pole 18c and the 18d of cylinder part 11.Therefore, when coil 2 was not subjected to electric excitation, the stop position of magnet 1 was arranged on a position, under this position, the center of each utmost point of the magnetized spot of magnet with the pivot Q of the center of the outer magnetic pole 18a of stator 18 and 18b and magnet 1
3The straight line that links together departs from mutually, as shown in figure 16.Under this position (deviation position), when coil 2 was subjected to electric excitation, outer magnetic pole 18a and 18b the power on the magnetized spot of magnet 1 of acting on of being excited was pointed to the direction of rotation of magnet 1.Therefore, magnet 1 is started smoothly.
And as mentioned before, the plasticity magnetic material that rotor magnet 1 usefulness injection molding forms forms, thereby can make it very little with respect to cylindrical shape thickness radially.Therefore, can make outer magnetic pole 18a, the 18b of stator 18 and the distance between internal magnetic pole 18c, the 18d very little, and can make the magnetic resistance of coil 2 and stator 18 formed magnetic circuits little.Therefore, can produce a large amount of magnetic fluxs, and become and to realize increasing motor output and reduce motor power (output) consumption, and reduce coil with little electric current.
In addition, can increase the mechanical strength of magnet 1, therefore, can make magnet 1 thinner with cylinder part 11.If make magnet 1 thinner, then can make the outer magnetic pole of stator 18 and the gap between the internal magnetic pole narrow, correspondingly, can reduce magnetic resistance.Therefore, becoming might be with little current drives magnet.
In the various embodiments described above, make the outer surface of magnet be divided into the n part along circumference, make them alternately be magnetized into the S utmost point and the N utmost point, and make the interior perimeter surface of magnet also be divided into the n part along circumference, make them alternately be magnetized into the S utmost point and the N utmost point, so that different with contiguous outer surface, but can only be divided into the n part to the outer surface of magnet, can make them alternately be magnetized into the S utmost point and the N utmost point.
Claims (6)
1. motor, be provided with a rotatable rotor magnet, along circle alternate be magnetized into different poles, a cylindrical stator, relative with described rotor magnet, between them, leave the gap, and coil, be installed in the inside of described stator, it is characterized in that, described coil is axial arranged along described rotor magnet, be subjected to the outer magnetic pole of described stator of described coil stimulating relative with the outer surface of described magnet, the internal magnetic pole of described stator is relative with the interior perimeter surface of described magnet, and prepares holding device, so that described magnet remains on a position, depart from mutually with the straight line that the pivot of the center of described outer magnetic pole and described magnet is linked together at the center of the utmost point of described magnet under this position.
2. according to the motor of claim 1, it is characterized in that described holding device comprises a described magnet and a location stator relative with the outer surface of described magnet.
3. according to the motor of claim 2, it is characterized in that described location stator and described outer magnetic pole integrally form.
4. motor according to claim 2 is characterized in that, the outer magnetic pole of described stator makes them not contact mutually with the inboard that described location stator is fixed to a cylindrical shape cover.
5. a motor has a magnet, a cylindrical stator, and a coil, axial arranged to encourage described stator, wherein along described magnet
The internal magnetic pole of described stator is relative with the interior perimeter surface of described magnet, and the outer magnetic pole of described stator is relative with the outer surface of described magnet, and described outer magnetic pole has first relative with described internal magnetic pole and the second portion not relative with described internal magnetic pole, wherein
The described magnet part relative with described second portion with described first be alternating magnetization along the circumferential direction, and phase place of phase deviation of the described magnet part relative with the described first part relative with described second portion with respect to described magnet is magnetized.
6. motor, be provided with a rotatable rotor magnet, along circle alternate be magnetized into different poles, a cylindrical stator, relative with described rotor magnet, between them, leave the gap, and coil, be installed in the inside of described stator, it is characterized in that, a cylinder part that forms with soft magnetic material is fixed on the inner-diameter portion whose of described rotor magnet, make described coil axial arranged along described rotor magnet, be subjected to the outer magnetic pole of described stator of described coil stimulating relative, and the internal magnetic pole of described stator is relative with the interior perimeter surface of described cylinder part with the outer surface of described magnet.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12531498A JP4011727B2 (en) | 1998-04-20 | 1998-04-20 | motor |
| JP125314/1998 | 1998-04-20 | ||
| JP125313/1998 | 1998-04-20 | ||
| JP125314/98 | 1998-04-20 | ||
| JP125313/98 | 1998-04-20 | ||
| JP12531398A JP3990811B2 (en) | 1998-04-20 | 1998-04-20 | motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1233103A CN1233103A (en) | 1999-10-27 |
| CN1178368C true CN1178368C (en) | 2004-12-01 |
Family
ID=26461779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB99105203XA Expired - Fee Related CN1178368C (en) | 1998-04-20 | 1999-04-20 | Motor |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6400055B1 (en) |
| EP (1) | EP0952660B1 (en) |
| KR (1) | KR100364581B1 (en) |
| CN (1) | CN1178368C (en) |
| DE (1) | DE69930061T2 (en) |
| MY (1) | MY118952A (en) |
| SG (1) | SG94323A1 (en) |
| TW (1) | TW459437B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3579642B2 (en) * | 2000-12-20 | 2004-10-20 | 台達電子工業股▲ふん▼有限公司 | Motor structure |
| US6465916B2 (en) * | 1998-12-04 | 2002-10-15 | Canon Kabushiki Kaisha | Motor |
| TW476180B (en) * | 1999-09-30 | 2002-02-11 | Sanyo Electric Co | Permanent magnet stepping motor |
| DE10135019A1 (en) * | 2001-07-18 | 2003-01-30 | Bosch Gmbh Robert | Electric motor with permanent magnet excitation |
| US6897579B2 (en) * | 2001-09-28 | 2005-05-24 | Canon Kabushiki Kaisha | Motor |
| KR20030046763A (en) * | 2001-12-06 | 2003-06-18 | 삼성전기주식회사 | Stepping motor |
| US6979918B2 (en) * | 2002-12-20 | 2005-12-27 | Canon Kabushiki Kaisha | Actuator |
| US6765319B1 (en) | 2003-04-11 | 2004-07-20 | Visteon Global Technologies, Inc. | Plastic molded magnet for a rotor |
| JP4387858B2 (en) * | 2004-04-14 | 2009-12-24 | キヤノン株式会社 | Stepping motor |
| KR100790542B1 (en) * | 2005-12-29 | 2008-01-02 | 엘지전자 주식회사 | Self magnetizing motor and stator structure for the same |
| JP4068653B2 (en) * | 2006-05-31 | 2008-03-26 | 山洋電気株式会社 | Rotor for motor |
| CN101154862B (en) * | 2007-09-03 | 2010-09-29 | 中国科学院电工研究所 | Brushless inner rotor of double mechanical port electric motor |
| JP5355029B2 (en) * | 2008-10-20 | 2013-11-27 | キヤノン株式会社 | Drive device |
| DE102009042452A1 (en) * | 2009-09-23 | 2011-03-31 | Elektromotorenwerk Grünhain GmbH & Co. KG | Cage rotor for electric machines, has rotor made of pierced motor sheet and multiple grooves with arbitrary geometric figure, where end area of grooves pointing to outer circumference of rotor is formed with rare earth material |
| KR101872897B1 (en) | 2011-04-25 | 2018-06-29 | 엘지이노텍 주식회사 | Rotor for torque sensor and torque sensor including the same |
| US9823146B2 (en) * | 2015-02-17 | 2017-11-21 | Steering Solutions Ip Holding Corporation | Axial flux focusing small diameter low cost torque sensor |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3149256A (en) | 1960-12-20 | 1964-09-15 | Kohlhagen Walter | Self-starting rotors for synchronous reaction motors |
| US3330975A (en) * | 1964-10-15 | 1967-07-11 | Vega Prec Lab Inc | Self-starting synchronous motor |
| FR2214990B1 (en) * | 1973-01-18 | 1976-05-14 | Lip Horlogerie | |
| US4012652A (en) * | 1973-04-26 | 1977-03-15 | Electrical Remote Control Company, Ltd. | Unidirectional self-starting electrical motors with shaded poles and shaded magnetic shunt |
| US4004168A (en) * | 1974-08-08 | 1977-01-18 | Tri-Tech, Inc. | Electric rotating machine |
| CH619329A5 (en) * | 1977-07-15 | 1980-09-15 | Sodeco Compteurs De Geneve | |
| JPS5831819B2 (en) * | 1978-03-10 | 1983-07-08 | 株式会社精工舎 | small motor |
| US4207483A (en) * | 1978-09-01 | 1980-06-10 | Warner Electric Brake & Clutch Co. | Step motor with circumferential stators on opposite sides of disc-like rotor |
| CH647107A5 (en) * | 1979-05-30 | 1984-12-28 | Landis & Gyr Ag | SYNCHRONOUS MOTOR. |
| FR2472867A1 (en) | 1979-12-26 | 1981-07-03 | Jaeger | ELECTRIC MOTOR WITH STEPPING ADVANCE AND MOTOREDUCTING ASSEMBLY EMPLOYING THE SAME |
| JPS61128763A (en) * | 1984-11-27 | 1986-06-16 | Copal Co Ltd | Stepping motor |
| CH665510A5 (en) * | 1984-12-06 | 1988-05-13 | Landis & Gyr Ag | SINGLE PHASE STEPPING MOTOR. |
| EP0196457A1 (en) * | 1985-04-01 | 1986-10-08 | Saia Ag | Single-phase stepping motor |
| JPS63113476U (en) * | 1987-01-14 | 1988-07-21 | ||
| EP0307706B1 (en) * | 1987-09-11 | 1992-06-03 | Siemens Aktiengesellschaft | Array of permanent magnets |
| US5097162A (en) * | 1989-09-26 | 1992-03-17 | North American Philips Corporation | Variable angle stepper motor with spring magnet |
| US4973866A (en) * | 1989-09-26 | 1990-11-27 | North American Philips Corporation | Variable angle stepper motor |
| US5384506A (en) | 1992-05-29 | 1995-01-24 | Canon Kabushiki Kaisha | Stepper motor |
| AU660249B2 (en) * | 1993-07-08 | 1995-06-15 | Mitsubishi Materials Corporation | Stepping motor |
| US5831356A (en) | 1996-04-08 | 1998-11-03 | Canon Kabushiki Kaisha | Compact cylindrical stepping motor and advancing device |
| US5925945A (en) | 1996-12-27 | 1999-07-20 | Canon Kabushiki Kaisha | Compact motor with enhanced workability |
| JP3517545B2 (en) * | 1997-02-13 | 2004-04-12 | キヤノン株式会社 | motor |
-
1999
- 1999-04-16 SG SG9901871A patent/SG94323A1/en unknown
- 1999-04-16 US US09/293,063 patent/US6400055B1/en not_active Expired - Fee Related
- 1999-04-19 TW TW088106243A patent/TW459437B/en not_active IP Right Cessation
- 1999-04-20 EP EP99303043A patent/EP0952660B1/en not_active Expired - Lifetime
- 1999-04-20 DE DE69930061T patent/DE69930061T2/en not_active Expired - Fee Related
- 1999-04-20 KR KR1019990014098A patent/KR100364581B1/en not_active IP Right Cessation
- 1999-04-20 CN CNB99105203XA patent/CN1178368C/en not_active Expired - Fee Related
- 1999-04-20 MY MYPI99001533A patent/MY118952A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0952660B1 (en) | 2006-03-01 |
| DE69930061D1 (en) | 2006-04-27 |
| KR100364581B1 (en) | 2002-12-16 |
| MY118952A (en) | 2005-02-28 |
| DE69930061T2 (en) | 2006-11-09 |
| CN1233103A (en) | 1999-10-27 |
| US6400055B1 (en) | 2002-06-04 |
| EP0952660A3 (en) | 2000-08-16 |
| TW459437B (en) | 2001-10-11 |
| KR19990083351A (en) | 1999-11-25 |
| EP0952660A2 (en) | 1999-10-27 |
| SG94323A1 (en) | 2003-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1178368C (en) | Motor | |
| CN1147044C (en) | Motor | |
| CN1140041C (en) | Motor | |
| CN1881752A (en) | Motor having device for limiting direction of rotation | |
| CN1172425C (en) | Electric motor | |
| CN1243351A (en) | Motor using internal permanent magnet rotor and apparatur driving unit adapting said motor | |
| JP2023030118A (en) | Motor including non-circular stator | |
| CN1815859A (en) | Induction motor having reverse-rotation preventing function | |
| CN1731654A (en) | Axial gap electric motor | |
| CN1794545A (en) | Hybrid induction motor | |
| CN1388623A (en) | Electric power generator with permanent magnetic rator | |
| CN1166719A (en) | Motor and advancing device | |
| CN1838508A (en) | Rotating electric machine | |
| CN1595776A (en) | Fan motor | |
| JP2004104986A (en) | Permanent magnet type rotary electric machine | |
| EP1220429A3 (en) | Stepping motor, stepping motor device and driving method thereof | |
| WO2008082057A1 (en) | Brushless dc motor, magnetizing method thereof and washing machine having the same | |
| EP1729403A3 (en) | Driving device | |
| CN1084542C (en) | Rotor assembling method, and motor having such rotor | |
| US20040251767A1 (en) | Axial flux electromotive generator having rotor magnets and shaped core assembly | |
| CN1310397C (en) | Motor | |
| CN1848633A (en) | Stepping motor and fan having the same | |
| CN1411127A (en) | Motor | |
| CN103872826B (en) | Cooling agent is supplied and collection device and the motor including the device | |
| CN1407697A (en) | Step motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041201 Termination date: 20100420 |